The Influence of Albedo on the Urban Microclimatic Street Canyon

In city, when temperatures run higher than those in suburban and rural areas, this generate a phenomenon called Urban Heat Island (UHI), this effect  occurs, primarily because growing numbers of buildings have supplanted vegetation and trees. The main causes of the different microclimatic conditions in cities are linked among other parameters to urban geometry which influences incoming and outgoing radiations as well as surface material properties, such as color and texture. In hot climates the elevated surface temperatures of materials directly affect, not only the urban microclimate, but also thermal comfort conditions in urban open spaces. In order to evaluate the microclimate variation of urban street canyon compared to the variation of walls and ground surfaces materials, series of field simulation are used by software tool, Envi-met v3.0, in down town of Constantine, Algeria